Screenreader Testcase needs updating

Screenreader testcase specifies use of arrow keys, but should mention tabs are needed to move between options, with the up/down arrow keys used to move between selections inside those options. In addition, step 32 a restart is not needed. The first boot should have the screenreader on and speaking right away.

EDIT: More tweaks;

step 31 shouldn't assume we have a cd in a physical drive. Also we should note and ensure progress is acurrately read to us as it installs.